The 6 gear manual gearbox is both lightweight and robust – it uses the same shift-cam design as found on the CRF250R & CRF450R.Let the true adventure begin. The 6 gear manual gearbox is both lightweight and robust – it uses the same shift-cam design as found on the CRF250R and CRF450R to ensure positive changes. An assist slipper clutch helps to maintain traction during downshifts or deceleration.